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What is immunity?
A:immunity is the body's own defense mechanism.It is the body's ability to recognize and eliminate any foreign matter(virus,bacteria,etc.)that enters into the body,to deal with its own cells of aging,injury,death and degeneration,and to identify and deal with mutant cells and virus-infected cells in the body.
According to modern immunology,immunity is the physiological response of the human body to recognize and eliminate"alien beings".The body's immune system performs this function.
Modern medical science has found that immunity is a factor closely related to aging,and the decline of immune function is one of the most important causes of aging.Some special cells of the body's immune system can devour and destroy invading bacteria,viruses,cells that have died of old age,cells that have changed and substances that cause abnormal reactions,and keep the body healthy from the stability of the environment.However,the immune function of the body begins to decline around the age of 30.This change is carried out quietly,slowly and continuously.